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    CREATE FUNCTION abseq(int, int) RETURNS BOOL AS
    $$
      begin return abs($1) = abs($2); end;
    $$ LANGUAGE plpgsql STRICT IMMUTABLE;

    CREATE OPERATOR |=| (
      PROCEDURE = abseq,
      LEFTARG = int,
      RIGHTARG = int,
      COMMUTATOR = |=|,
      hashes, merges);

    CREATE FUNCTION abshashfunc(int) RETURNS int AS
    $$
      begin return hashint4(abs($1)); end;
    $$ LANGUAGE plpgsql STRICT IMMUTABLE;

    CREATE OPERATOR CLASS abs_int_hash_ops FOR TYPE int4
      USING hash AS
      OPERATOR 1 |=|,
      FUNCTION 1 abshashfunc(int);

    CREATE FUNCTION abslt(int, int) RETURNS BOOL AS
    $$
      begin return abs($1) < abs($2); end;
    $$ LANGUAGE plpgsql STRICT IMMUTABLE;

    CREATE OPERATOR |<| (
      PROCEDURE = abslt,
      LEFTARG = int,
      RIGHTARG = int);

    CREATE FUNCTION absgt(int, int) RETURNS BOOL AS
    $$
      begin return abs($1) > abs($2); end;
    $$ LANGUAGE plpgsql STRICT IMMUTABLE;

    CREATE OPERATOR |>| (
      PROCEDURE = absgt,
      LEFTARG = int,
      RIGHTARG = int);

    CREATE FUNCTION abscmp(int, int) RETURNS int AS
    $$
      begin return btint4cmp(abs($1),abs($2)); end;
    $$ LANGUAGE plpgsql STRICT IMMUTABLE;

    CREATE OPERATOR CLASS abs_int_btree_ops FOR TYPE int4
      USING btree AS
      OPERATOR 1 |<|,
      OPERATOR 3 |=|,
      OPERATOR 5 |>|,
      FUNCTION 1 abscmp(int, int);

    drop table if exists atab_old_hash;
    drop table if exists btab_old_hash;
    CREATE TABLE atab_old_hash (a int) DISTRIBUTED BY (a);
    CREATE TABLE btab_old_hash (b int) DISTRIBUTED BY (b);

    INSERT INTO atab_old_hash VALUES (-1), (0), (1);
    INSERT INTO btab_old_hash VALUES (-1), (0), (1), (2);

    set optimizer_expand_fulljoin=1;

    SELECT a, b FROM atab_old_hash full join btab_old_hash on (a |=| b);

    Expect Merge Join using UNION ALL (Append)
  ]]>
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